For any κ in [1, log log n], an m×n array admits an O(κ mn (log m + log log n))-bit 2D-RMQ encoding with O(log^{1/κ} n) query time.
Approximate range mode and range median queries
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Near-Optimal and Efficient Encoding for Two-Dimensional Range Minimum Queries
For any κ in [1, log log n], an m×n array admits an O(κ mn (log m + log log n))-bit 2D-RMQ encoding with O(log^{1/κ} n) query time.